Colossal dielectric constant up to gigahertz at room temperature

Krohns, S.; Lunkenheimer, P.; Kant, Ch.; Pronin, A. V.; Brom, H. B.; Nugroho, A. A.; Diantoro, M.; Loidl, A.
March 2009
Applied Physics Letters;3/23/2009, Vol. 94 Issue 12, p122903
Academic Journal
The applicability of recently discovered materials with extremely high (“colossal”) dielectric constants, required for future electronics, suffers from the fact that their dielectric constant [variant_greek_epsilon]′ only is huge in a limited frequency range below about 1 MHz. In the present report, we show that the dielectric properties of a charge-ordered nickelate, La15/8Sr1/8NiO4, surpass those of other materials. Especially, [variant_greek_epsilon]′ retains its colossal magnitude of >10 000 well into the gigahertz range.


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